Practice Test: Question Set - 50
1. The lift of a balloon is
- (A) Increased, as it rises to a higher altitude
- (B) Due to the weight of the atmospheric air, that
it displaces
- (C) Not dependent on the temperature of the
atmosphere
- (D) None of these
2. A globe valve is the most suitable for applications, in which
- (A) Fluid flow control is required
- (B) Fluid contains dispersed solid particles
- (C) Valve is required to be either fully open or fully closed
- (D) One way flow is required
3. Unit of mass velocity is
- (A) kg/hr
- (B) kg/m2. hr
- (C) kg/m2
- (D) kg/m3. hr
4. Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' dimensions, the quantities can be arranged into __________ independent dimensionless parameters.
- (A) m
- (B) n
- (C) n-m
- (D) n/m
5. Minimum fluidization velocity for a specific system depends upon the
- (A) Particle size
- (B) Fluid viscosity
- (C) Density of both the particle & the fluid
- (D) All (a), (b) and (c)
6. For an ideal fluid flow, Reynolds number is
- (A) 2100
- (B) 100
- (C) 0
- (D) ∞
7. When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an
- (A) Ejector
- (B) Blower
- (C) Injector
- (D) Airlift
8. Permanent pressure loss in a well designed Venturimeter is about __________ percent of the venturi differential.
- (A) 1
- (B) 10
- (C) 30
- (D) 50
9. In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is
- (A) The velocity of sound
- (B) Dependent on its cross-sectional area
- (C) Dependent on fluid viscosity
- (D) Dependent on fluid density
10. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is
- (A) √(HW/π)
- (B) HW/2 (H + W)2
- (C) HW/4 (H + W)2
- (D) 2HW/(H + W)
11. Pressure drop for laminar fluid flow through a circular pipe is given by
- (A) 4f (L/D) (v2/2gc) ρ
- (B) 32 (µLV/gc D2)
- (C) 16/NRe
- (D) (fLρ/D) (v2/2gc)
12. The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is
- (A) 4(Ro-Ri)
- (B) √(Ro-Ri)
- (C) 2(Ro-Ri)
- (D) Ro + Ri
13. What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?
- (A) 0.61 - 0.63
- (B) 0.5 - 0.75
- (C) 0.75 - 0.90
- (D) 0.35 - 0.55
14. Flow measurement in an open channel is done by a/an
- (A) Venturimeter
- (B) Orificemeter
- (C) Weir
- (D) Rotameter
15. Major loss in sudden contraction in pipe flow is due to
- (A) Boundary friction
- (B) Flow contraction
- (C) Expansion of flow after sudden contraction
- (D) None of these
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